src/machine-id-setup/machine-id-setup-main.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <getopt.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26
  27 #include "log.h"
  28 #include "machine-id-setup.h"
  29 #include "util.h"
  30
  31 static const char *arg_root = NULL;
  32 static bool arg_commit = false;
  33
  34 static void help(void) {
  35         printf("%s [OPTIONS...]\n\n"
  36                "Initialize /etc/machine-id from a random source.\n\n"
  37                "  -h --help             Show this help\n"
  38                "     --version          Show package version\n"
  39                "     --root=ROOT        Filesystem root\n"
  40                "     --commit           Commit transient ID\n"
  41                , program_invocation_short_name);
  42 }
  43
  44 static int parse_argv(int argc, char *argv[]) {
  45
  46         enum {
  47                 ARG_VERSION = 0x100,
  48                 ARG_ROOT,
  49                 ARG_COMMIT,
  50         };
  51
  52         static const struct option options[] = {
  53                 { "help",      no_argument,       NULL, 'h'           },
  54                 { "version",   no_argument,       NULL, ARG_VERSION   },
  55                 { "root",      required_argument, NULL, ARG_ROOT      },
  56                 { "commit",    no_argument,       NULL, ARG_COMMIT    },
  57                 {}
  58         };
  59
  60         int c;
  61
  62         assert(argc >= 0);
  63         assert(argv);
  64
  65         while ((c = getopt_long(argc, argv, "hqcv", options, NULL)) >= 0)
  66
  67                 switch (c) {
  68
  69                 case 'h':
  70                         help();
  71                         return 0;
  72
  73                 case ARG_VERSION:
  74                         return version();
  75
  76                 case ARG_ROOT:
  77                         arg_root = optarg;
  78                         break;
  79
  80                 case ARG_COMMIT:
  81                         arg_commit = true;
  82                         break;
  83
  84                 case '?':
  85                         return -EINVAL;
  86
  87                 default:
  88                         assert_not_reached("Unhandled option");
  89                 }
  90
  91         if (optind < argc) {
  92                 log_error("Extraneous arguments");
  93                 return -EINVAL;
  94         }
  95
  96         return 1;
  97 }
  98
  99 int main(int argc, char *argv[]) {
 100         int r;
 101
 102         log_parse_environment();
 103         log_open();
 104
 105         r = parse_argv(argc, argv);
 106         if (r <= 0)
 107                 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 108
 109         if (arg_commit)
 110                 r = machine_id_commit(arg_root);
 111         else
 112                 r = machine_id_setup(arg_root);
 113
 114
 115         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 116 }